1 /* 2 * Copyright2001 by the Massachusetts Institute of Technology. 3 * Copyright 1993 by OpenVision Technologies, Inc. 4 * 5 * Permission to use, copy, modify, distribute, and sell this software 6 * and its documentation for any purpose is hereby granted without fee, 7 * provided that the above copyright notice appears in all copies and 8 * that both that copyright notice and this permission notice appear in 9 * supporting documentation, and that the name of OpenVision not be used 10 * in advertising or publicity pertaining to distribution of the software 11 * without specific, written prior permission. OpenVision makes no 12 * representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied warranty. 14 * 15 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 16 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 17 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR 18 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF 19 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR 20 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 21 * PERFORMANCE OF THIS SOFTWARE. 22 */ 23 24 #include "gssapiP_krb5.h" 25 #include "k5-int.h" 26 27 /* 28 * $Id: util_seqnum.c 15007 2002-11-15 16:12:20Z epeisach $ 29 */ 30 31 krb5_error_code 32 kg_make_seq_num(context, key, direction, seqnum, cksum, buf) 33 krb5_context context; 34 krb5_keyblock *key; 35 int direction; 36 krb5_ui_4 seqnum; 37 unsigned char *cksum; 38 unsigned char *buf; 39 { 40 unsigned char plain[8]; 41 42 plain[4] = direction; 43 plain[5] = direction; 44 plain[6] = direction; 45 plain[7] = direction; 46 if (key->enctype == ENCTYPE_ARCFOUR_HMAC ) { 47 /* Yes, Microsoft used big-endian sequence number.*/ 48 plain[0] = (seqnum>>24) & 0xff; 49 plain[1] = (seqnum>>16) & 0xff; 50 plain[2] = (seqnum>>8) & 0xff; 51 plain[3] = seqnum & 0xff; 52 return kg_arcfour_docrypt (context, key, 0, 53 cksum, 8, 54 &plain[0], 8, 55 buf); 56 57 } 58 59 plain[0] = (unsigned char) (seqnum&0xff); 60 plain[1] = (unsigned char) ((seqnum>>8)&0xff); 61 plain[2] = (unsigned char) ((seqnum>>16)&0xff); 62 plain[3] = (unsigned char) ((seqnum>>24)&0xff); 63 64 return(kg_encrypt(context, key, KG_USAGE_SEQ, cksum, plain, buf, 8)); 65 } 66 67 krb5_error_code kg_get_seq_num(context, key, cksum, buf, direction, seqnum) 68 krb5_context context; 69 krb5_keyblock *key; 70 unsigned char *cksum; 71 unsigned char *buf; 72 int *direction; 73 krb5_ui_4 *seqnum; 74 { 75 krb5_error_code code; 76 unsigned char plain[8]; 77 78 if (key->enctype == ENCTYPE_ARCFOUR_HMAC) { 79 code = kg_arcfour_docrypt (context, key, 0, 80 cksum, 8, 81 buf, 8, 82 plain); 83 } else { 84 code = kg_decrypt(context, key, KG_USAGE_SEQ, cksum, buf, plain, 8); 85 } 86 if (code) 87 return(code); 88 89 if ((plain[4] != plain[5]) || 90 (plain[4] != plain[6]) || 91 (plain[4] != plain[7])) 92 return((krb5_error_code) KG_BAD_SEQ); 93 94 *direction = plain[4]; 95 if (key->enctype == ENCTYPE_ARCFOUR_HMAC) { 96 *seqnum = (plain[3]|(plain[2]<<8) | (plain[1]<<16)| (plain[0]<<24)); 97 } else { 98 *seqnum = ((plain[0]) | 99 (plain[1]<<8) | 100 (plain[2]<<16) | 101 (plain[3]<<24)); 102 } 103 104 return(0); 105 } 106